US7846284B2 - Process for recycling scrap of shoe stiffener - Google Patents
Process for recycling scrap of shoe stiffener Download PDFInfo
- Publication number
- US7846284B2 US7846284B2 US12/316,539 US31653908A US7846284B2 US 7846284 B2 US7846284 B2 US 7846284B2 US 31653908 A US31653908 A US 31653908A US 7846284 B2 US7846284 B2 US 7846284B2
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- United States
- Prior art keywords
- core layer
- clumps
- scrap
- net fabric
- shoe stiffener
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B17/0404—Disintegrating plastics, e.g. by milling to powder
- B29B17/0408—Disintegrating plastics, e.g. by milling to powder using cryogenic systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
- B29B17/0042—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/024—Woven fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K2105/0809—Fabrics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/26—Scrap or recycled material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/50—Footwear, e.g. shoes or parts thereof
- B29L2031/504—Soles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2272/00—Resin or rubber layer comprising scrap, waste or recycling material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/10—Fibres of continuous length
- B32B2305/18—Fabrics, textiles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/70—Scrap or recycled material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- a conventional shoe stiffener as shown in FIG. 1 comprises a core layer 1 consisting of a main resin material of thermoplastic polyurethane and a filler selected from polycarbonate, polyacrylic, polystyrene or other resin materials having high melting point and hardness, an upper and a lower reinforcing net fabric layer 2 , 3 disposed on opposite sides of the core layer 2 for sandwiching the core layer 1 in between the upper and lower reinforcing net fabric layers 2 , 3 which are made of cotton, nylon, or T/C (Polyethylene Terephthalate/Cotton) fabric.
- a core layer 1 consisting of a main resin material of thermoplastic polyurethane and a filler selected from polycarbonate, polyacrylic, polystyrene or other resin materials having high melting point and hardness
- an upper and a lower reinforcing net fabric layer 2 , 3 disposed on opposite sides of the core layer 2 for sandwiching the core layer 1 in between the upper and lower reinforcing net fabric layers 2 , 3 which are
- Such a shoe stiffener is formed as a thin sheet as extruded through a T-die of an extruder to have a dimension of 0.4 mm ⁇ 2.0 mm (thickness) ⁇ 1 ⁇ 1.5 m (length) ⁇ 1 m (width), which is then cut into desired shape or size for making a shoe stiffener such as a toe stiffener or a counter stiffener. Since the stiffener shapes are different from one another, much waste or scrap of the shoe stiffener will be produced, which ranges from 10 ⁇ 20% based on the raw material of the total stiffener.
- the stiffener scrap contains long filaments existing in the reinforcing net fabric layers ( 2 , 3 ), which are difficult to be separated from the resin materials of polyurethane and the filler. So, the scrap is traditionally disposed for incineration or for underground disposal, to thereby cause big problem of environmental protection and thereby waste material resources.
- the object of the present invention is to provide a process for recycling scrap of shoe stiffener comprising the steps of:
- FIG. 1 is a sectional drawing showing a conventional shoe stiffener sheet.
- FIG. 2 is a sectional drawing of a shoe stiffener sheet as made in accordance with the present invention.
- the present invention discloses a process for recycling the scrap or waste of a shoe stiffener sheet which is composed of a core layer 1 , an upper reinforcing net fabric layer 2 and a lower reinforcing net fabric layer 3 disposed on two opposite sides (or a top and a bottom side) of the core layer 1 .
- the core layer 1 may be a composition (100% by weight) consisting of a thermoplastic polyurethane (TPU) resin material (50 ⁇ 80% by weight) and a filler (20 ⁇ 50% by weight) selected from polycarbonate, polyacrylic, polystyrene, and the other resin materials of high melting point and high hardness.
- TPU thermoplastic polyurethane
- the upper and lower reinforcing net fabric layers 2 , 3 are disposed on two opposite sides of the core layer 1 to form a multiple-layer shoe stiffener sheet. In other words, the core layer 1 is sandwiched in between the upper and lower net fabric layers 2 , 3 .
- Each reinforcing net fabric layer 2 or 3 may be made of cotton, Nylon, T/C (Polyethylene Terephthalate/Cotton) fabric or other fibrous materials, having long filaments presented in the fabric layer.
- the net fabric layer 2 or 3 may be woven or non-woven fabric layer having a plurality of net or mesh apertures formed therein.
- Such a net fabric layer 2 or 3 when covered on the core layer 1 may be bonded or adhered with the resinous materials (TPU) in the core layer 1 . Therefore, the two net fabric layers 2 , 3 are each overlaid or covered on a top or a bottom surface of the core layer 1 at a temperature higher than the melting point (above 60° C.) of TPU to melt the TPU resin to be tacky for adhering the TPU resin in the core layer 1 with either the upper net fabric layer 2 or the lower net fabric layer 3 to thereby form a well boned triple-layer shoe stiffener sheet as shown in FIG. 2 , in which the core layer 1 has been incorporated therein with short fibers 4 as a reinforcing fibrous material, which will be described in detail hereinafter.
- TPU resinous materials
- the process of the present invention comprises the steps of:
- each short fiber 4 as impregnated or encapsulated with TPU in the core layer 1 will be “interlocked” with the fibrous material in the net fabric layer 2 , 3 (like a “cross-linking” in polymer chemistry), especially when pressed as passing through at least a pair of cooling rollers (not shown) provided at downstream of the extruder, to thereby firmly fasten and laminate the upper and lower reinforcing net fabric layers 2 , 3 on opposite sides of the core layer 1 .
- TPU thermoplastic polyurethane
- the present invention provides a process with plural advantages, not only for recycling the scrap of shoe stiffeners for re-use of the scrap and for better environmental protection; but also for enhancing the multiple-layer construction of the shoe stiffener sheet due to the interlocking mechanism as aforementioned for preventing delamination of the multiple-layer stiffener for enhancing better product quality of the shoe stiffener.
- the present invention may only include the four steps, namely, Step 1 through Step 4, by eliminating the final step (or Step 5), to therefore produce crushed product including pellets of resin materials (TPU and filler) and short fibers, which may be blended with a “fresh” feed (containing no regenerated material as taught by this invention) to be combinably fed into an extruder for producing a shoe stiffener sheet containing a portion, e.g., 20 ⁇ 50% (but not limited), of the regenerated material of this invention based on the total stiffener.
- a “fresh” feed containing no regenerated material as taught by this invention
- Step 3 for freezing the dense clumps at low temperature of 0° C. ⁇ 20° C. the frozen clumps including TPU resin material will become brittle at such a low temperature and will thus be easily crushed in the following or subsequent step, namely the Step 4. Meanwhile, the low-temperature of the frozen clumps may also cool the crushing knife or blade to lower its operating temperature in order to maintain the process operation smoothly.
- the short fibers as obtained from original upper or lower net fabric layer 2 or 3 will be impregnated, saturated or encapsulated by the resin material such as TPU in the core layer 1 to form a composite consisting of the matrix of resin material (TPU) and the reinforcing fibers 4 especially when extruded through the T-die at a temperature of 100 ⁇ 130° C. which is higher than the melting point of TPU (60° C.). So, the core layer 1 is now becoming a “composite” layer having fibers 4 reinforced therein ( FIG. 2 ).
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Textile Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
- 1. Kneading the collected scrap of shoe stiffener, having a core layer of TPU resin material (with filler) sandwiched in between two opposite net fabric layers, to be dense clumps;
- 2. Freezing the dense clumps to be hard frozen clumps;
- 3. Crushing the hard frozen clumps to be a crushed product including pellets of resin material, and short fibers; and
- 4. Extruding the crushed product including pellets and short fibers to produce a regenerated core layer; and covering or laminating two net fabric layers on opposite sides of the regenerated core layer to obtain a regenerated shoe stiffener sheet to enhance environmental protection and prevent from wasting of material resources.
Description
- 1. Kneading the collected scrap of shoe stiffener, having a core layer of TPU resin material (with filler) sandwiched in between two opposite net fabric layers, to be a plurality of dense clumps of kneaded scrap;
- 2. Freezing the dense clumps of kneaded scrap at temperature of 0° C.˜−20° C. to be hard frozen clumps;
- 3. Crushing the hard frozen clumps to be a crushed product including pellets of resin material, and short fibers; and
- 4. Extruding the crushed product including pellets and short fibers through a T-die of an extruder to produce a regenerated core layer for shoe stiffener; and covering or laminating two net fabric layers on opposite sides of the regenerated core layer to obtain a regenerated shoe stiffener sheet to thereby enhance environmental protection and prevent from wasting of material resources.
- 1. Collecting scrap of shoe stiffener and removing any unexpected matters or dirts in the scrap;
- 2. Kneading the scrap as collected by a kneader at a temperature of 60° C.˜150° C., which is higher than the melting point (about 60° C.) of thermoplastic polyurethane (TPU), and then compressing under cooling the bulk or loose scrap to be a plurality of dense clumps each having an average diameter of 30˜50 centimeters (having irregular shapes);
- 3. Freezing the dense clumps at a low temperature ranging 0° C.˜−20° C. in a freezing chamber (or room) to be frozen clumps each being hard but brittle at such a low temperature;
- 4. Crushing the frozen clumps to be a crushed product including pellets of resin materials each pellet having a diameter of 0.1˜1 cm, and short fibers each fiber having a length less than 1 cm as being cut from long filaments existing in the original upper and lower net fabric layers; and
- 5. Extruding the crushed product through a T-die of an extruder at temperature of 100˜130° C. to form a regenerated core layer; and laminating two reinforcing net fabric layers on opposite sides of the regenerated core layer to produce a regenerated shoe stiffener sheet having the core layer sandwiched in between the upper and lower reinforcing net fabric layers.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/316,539 US7846284B2 (en) | 2008-12-15 | 2008-12-15 | Process for recycling scrap of shoe stiffener |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/316,539 US7846284B2 (en) | 2008-12-15 | 2008-12-15 | Process for recycling scrap of shoe stiffener |
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US20100147444A1 US20100147444A1 (en) | 2010-06-17 |
US7846284B2 true US7846284B2 (en) | 2010-12-07 |
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US12/316,539 Expired - Fee Related US7846284B2 (en) | 2008-12-15 | 2008-12-15 | Process for recycling scrap of shoe stiffener |
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US (1) | US7846284B2 (en) |
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US9199315B2 (en) | 2000-06-02 | 2015-12-01 | Kennametal Inc. | Twist drill and method for producing a twist drill which method includes forming a flute of a twist drill |
US20100199406A1 (en) | 2009-02-06 | 2010-08-12 | Nike, Inc. | Thermoplastic Non-Woven Textile Elements |
US8906275B2 (en) | 2012-05-29 | 2014-12-09 | Nike, Inc. | Textured elements incorporating non-woven textile materials and methods for manufacturing the textured elements |
US9682512B2 (en) | 2009-02-06 | 2017-06-20 | Nike, Inc. | Methods of joining textiles and other elements incorporating a thermoplastic polymer material |
US20130255103A1 (en) | 2012-04-03 | 2013-10-03 | Nike, Inc. | Apparel And Other Products Incorporating A Thermoplastic Polymer Material |
ITUB20151896A1 (en) * | 2015-07-07 | 2017-01-07 | Pami S R L | COUNTERFEITING FOR FOOTWEAR, PARTICULARLY OF THE TYPE OF IMPROVED COMFORT, AND PROCEDURE FOR IMPLEMENTATION. |
KR102488564B1 (en) | 2018-04-11 | 2023-01-13 | 삼성전자 주식회사 | Woven pattern housing and electronic device using the same |
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US5346934A (en) * | 1992-12-21 | 1994-09-13 | Chriss Henry T | Footwear additive made from recycled materials |
US5478865A (en) * | 1995-04-20 | 1995-12-26 | Chang; Ching-Bing | Method of recycling a discarded polyurethane foam article |
US20020022428A1 (en) * | 1999-03-10 | 2002-02-21 | Gareth Parker | Laminar materials suitable for use in the manufacture of shoes, method of making same and shoe stiffener materials including said laminar materials |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US5346934A (en) * | 1992-12-21 | 1994-09-13 | Chriss Henry T | Footwear additive made from recycled materials |
US5478865A (en) * | 1995-04-20 | 1995-12-26 | Chang; Ching-Bing | Method of recycling a discarded polyurethane foam article |
US20020022428A1 (en) * | 1999-03-10 | 2002-02-21 | Gareth Parker | Laminar materials suitable for use in the manufacture of shoes, method of making same and shoe stiffener materials including said laminar materials |
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US20100147444A1 (en) | 2010-06-17 |
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